Dynamo-electric machine.



No. 821,249. PATENTED MAY 22, 1906.

. 2. LUNDELL.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAY 20, 1906.

2 SHEETS-SHEET 1f .M JV

fi I K M 0 1; L

11 H j 5 c fl z i I l I WITNESSES: 4 2% M Attorney,

PATENTED MAY 22, 1906 R. LUNDELL. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAY 20, 1905.

2. SHBBTS-SHEBT 2 I VENTOR WITNESSES 5'5 A represents the laminatedari'nature-core,

RoB RrfnUNDErjL, or NEwl-YoeK, N. Y.

f: N M -EL'E TRIQ" MACHINE.

To all, whmn it nut?! erntcer'1'z I. I

Be-it known that I, ROBERT LUN ELL, a citlzenof the UnitedS.tates,-res1ding in New .York, borough of Manhattan, county and Stateof New York, :have madea new and useful. Invention In -Dynamo.- Electr1cMachines, of which the following is a' specification. 4

My invention embodies improvements .'in

the, construction of the pole-pieces and the end plates for thearmature-core whereby most excellent ventilation is obtained fordissipating the heatgeneratedm both the fieldcoils, and the arm aturewithout in creasing in the least the. length of: the. armature or theoverall dimensions ofthemachine. In fact,

theim I roved systempf; ventilation makes it possib e to reduce-thelengthof the armature I by an amount equal'to the width of thecusternary air-ducts ii thearmature-core,which ducts maybeentirelydispensedwith because of the improved construction.v

My invention embodies. in particular certain improvementsin theconstruction of the end plates for the laminated type of polepier-esll();\VI and described in, a prior United States Patent, 0. 729,879,granted to me on ,the 2d day of. June, 1903. .By reason of \the saidimprovements the ventilation above rewferredtois made particularly ectve, and the laininations inthe p( )le pieces are made self- I adusLIng', so at to accurately seat themselves against the'inner surfaceof the yoke, when the pole-pieces nre-= finally secured in their properpositions. Y Y

heferring to the accompanying drawings, which are attached to and madepart of this specification, Figure isa'side elevational view of a motor,showing the upper portion thereof in section in order to clearlyillustrate the improved construction. The field-magnet of this motor issimilar to the one shown and described in the United States Patent No.729,879, above referred to. Fig. 2 is a front viewof one of the endplates for the armature-core, the right-hand portion being shown insection for the purpose of better illustration. Fig. 3 is a sectionalView of one of the polep ie(-.es, taken at a right angle to thedirection of the shaft. Fig. 4 is a plan view of a complete pole-piece,showing also the field-coil and Fig. 5 is a front View of the samepole-piece without the field-coil. I

Referring now more particularly to Fig. 1,

and B and (.3 end plates for the same, each i l Specifi'catio'n ofLettersflPatent. was. iiierMi-i io, 1905. re No. 261.580.

loose to turn-armlnd the rivet-bar.

icatented May 22, 1906.

consisting of an. iriner disk-like portion D, which is joined bynumerous web-like arms E'F' G, &c., -(see Fig. 2,) to another outerdisk-like portion or flange H, having a large hole through its center,as clearly shown on the drawings. I is the commutator, which is of aspider type, permitting free passage of air through its center. Jrepresents an armature-coil as it is customary to illustrate thesame ona shop-drawing, K represents one of the field-coils in sectional View,and L represents the laminated core of the correspending pole-piece,also shown in section, the

section being taken on the broken line X Y, Fig. 4. M and N represent apair of polar end plates, which in Fig. 1 are shown in section, alsotaken on the line X Y of Fig.4. These polar end plates are shownindetailin Figs. 4 and5. represents a stout rivet bar or rod which is reduced toa smaller dimen: sion near its ends,-so as to form shouldersagainstwhich the end plates are firmly riveted.

The end plates M and N are on their inner sides provided withcountersunk holes made to lit the rivetbar O. i The said plates haveon-their'outersides tapered holes, which are made amn'oximately squareat the edges so that the end plates cannot possibly turn when onceriveted together. (See Figs. 4 and. 5;) As the end plates are rivetedagainst the large shoulders of the rivet-bar O the distance between theplates, as well as the alinement of the plates, will be perfectlyaccurate, even though the lanlinations may be fairly It will thus beunderstood that the laminations of the pole-pieces will adjustthemselves to a perfect [it against the inner surface of the yoke as thepole-pieces are drawn up against the same. The end plates M and N arecast (or drop-forged) with large channels on their inner sides, asclearly shown in Figs. 1 4, and

5. These channels make excellent ventilating-ducts between thepole-cores and the field-coils. it will be noticed from inspection of Fig. 1 that these channels or ducts are in alinement with the well-knownducts or spaces which are necessarily obtained between the armature-coreand the coils or Winding-howls of a toothed drum-armature. (See forillustration Fig. 4 of a prior United States Patent No. 714,721, grantedto me on the 2d day of December, 1902.)

'llhere is usually some ventilation through these ducts or spacesbetween the heads of the fined in the sp acesbetween the armature-core,

the'webs E F G, &c., and the disk-shaped outer flange H will be putunder pressure when the armature is revolving, according to the theoryof an ordinary blower. The air will thus be forced out through theabovementioned spaces between the teeth and theheads of the winding upthrough the channels or ducts in the pole-plates and finally around thefield-coils, as shown by the arrows in Figs. 1 and 4. It becomespossible by this method of ventilation to keep the temperatureexceedingly uniform in the different parts of a dynamo or motor.

VVhen a similar construction is applied to entirely-inclosed motors, thehot air will always be forced against the outer framework and thecovers, which-parts of course have to dissipate all of the heatgenerated in the motor.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. A dynamo-electric machine having poles provided with air-ducts and anarma ture having air-spaces between the heads of the armature-windingand the ends of the armature-core; in combination with means for forcingair successively through said air spaces and ducts, substantially asdescribed.

2. A dynamo-electric machine having poles provided with air-ductsbetween the field-coils and the sides of the poles and an armaturehaving air-spaces between the heads of the armature-winding and the endsof the armature-core in combination with a blower carried by thearmature for forcing air successively through said air spaces and ducts,substantially as described.

3. A dynamo electric machine havin laminated pole-cores; in combinationwith polar end plates provided with air-ducts through which air may beforced, substantially as described 4. A dynamoelectric machine havinglaminated ole-cores' in combination with polar end p ates provided withair-channels on their inner sides where they abut against thelaminations, substantially as described.

5. Alaminated pole-core having a pair of supporting end plates; incombination with a rivet-bar passing through the laminations and the endplates, said rivet-bar being pro vided with shoulders against which theend lates may be riveted so that the distance etween the said end platesmay be accurate while the laminations may be comparatively loose,substantially as described.

6. A dynamo-electric machine provided with an armature-core carryingarmaturecoils so wound thereon as to provide airspaces between the endsof the windin s; a field core or cores and field coil or coils t erefor;in combination with air ducts or channels between said parts; to etherwith ineans carried by and rotating wit the armature for forcing airthrough said'spaces and ducts or channels, substantially as described.

7. A dynamo-electric machine having airspaces between the. ends of thearmature-coils and air ducts'or channels extending around two sides ofthe field-coils; the field-core and a part of the frame of the machineconstituting one wall of said ducts or channels, and the two sides ofthe coils the other wall thereof; in combination with means carried byand-rotating with the armature for forcing air through the air-spaces ofthe armaturecoils and the aforesaid air ducts or channels, whereby allparts of the machine are maintained at minimum .temperature,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' ROBERT LUNDELL.

Witnesses:

O. J. KINTNER, M. F. KEATING.

